Central vacuum



FIG. 1 is a front perspective view of a central vacuum showing the claimed design.

FIG. 2 is a front elevation view of the central vacuum of FIG. 1.

FIG. 3 is a rear elevation view of the central vacuum of FIG. 1.

FIG. 4 is a right side elevation view of the central vacuum of FIG. 1.

FIG. 5 is a left side elevation view of the central vacuum of FIG. 1.

FIG. 6 is a top plan view of the central vacuum of FIG. 1; and,

FIG. 7 is a bottom plan view of the central vacuum of FIG. 1. 

The ornamental design for a central vacuum, as shown and described. 